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. 2014 Mar 14;8:24. doi: 10.3389/fninf.2014.00024

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Copyright © 2014 Eklund, Dufort, Villani and LaConte.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Left: One slice of one fMRI dataset used for testing the motion correction algorithms. Right: The same slice after the application of a random translation and rotation, and addition of a shading (gradient) increasing upwards. The shading will affect all algorithms that use the image intensity directly. The phase based algorithm used in BROCCOLI will, however, not be affected by this shading. The main reason for this is that quadrature filters are bandpass filters, which remove low frequency variations (e.g., shadings) as well as high frequency variations (e.g., noise).